Http://www.adobe.com/support/security/bulletins/apsb06-20.html
If you are using Adobe Reader 7.xin windows, we recommend that you update it to Adobe Reader 8 as soon as possible. If the new version cannot be updated, manually add a patch according to official instructions:
1. Exit Internet Explorer, Adobe Reader, and Adobe Acrobat, if necessary.
2. browse to <volume >:\ Program Files \ Adobe \ Acrobat 7.0 \ ActiveX. note: If you did not install acrobat to the default location, browse to the location of your Acrobat 7.0 folder.
3. Select transform pdf. dll and delete it.
4. Download the pdf. dll file provided here: http://www.adobe.com/support/security/bulletins/acropdf.dll
5. Copy the new release pdf. dll file in to the ActiveX directory.
Alternatively, you can select other PDF reading/modification tools on the Windows platform, such:
Http://www.download.com/Foxit-PDF-Reader/3000-2079_4-10313206.html
Dawei comments
ArticleSource: http://www.blogjava.net/sean/archive/2006/12/07/86174.html